As a group dedicated to finding people homes, realtors provide a pretty valuable service to others. One of the best ways realtors can drum up extra business is by going above and beyond for their current customers. Word-of-mouth referrals are one of the best forms of advertising and people will talk about their realtor for years; whether good or bad. At the close of a sale, make sure to also ask your clients for a testimonial for you to use in your marketing literature.